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Advances for vessels under construction and acquisition of vessels (Details) $ / shares in Units, $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 28, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |
Advances for vessels under construction and acquisition of vessels | $ 46,480 |  | $ 48,574
Newbuilding Newcastlemax dry bulk vessels |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of contracts for Newbuildings acquired |  | 3 |
Number of shares issued as part of the final consideration | shares |  | 3,304,735 |
Share market price | $ / shares |  | $ 13 |
Description of Capital leases, Term of contract | ten-year bareboat charter |  |
Capital leased assets, Number of vessels |  | 3 |
Newbuilding Newcastlemax dry bulk vessels | Financed by CSSC |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Capital lease obligation recognised |  | $ 104,400 |
Capital expenditure not yet paid |  | 103,844 |
Newbuilding Newcastlemax dry bulk vessels | Financed by CSSC | Per OCC vessel |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Vessel purchase price obligation |  | 10,440 |
Capital lease obligation recognised |  | $ 34,800 |
Songa and Augustea vessels |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Advances for vessels under construction and acquisition of vessels | $ 1,997 |  |

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- Definition Future cash outflow to pay for construction in progress expenditures that have occurred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition A general description of the lessee's leasing arrangements including, but not limited to, the following: a) the basis on which contingent rental payments are determined; (b) the existence and terms of renewal or purchase options and escalation clauses; (c) restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164451&loc=d3e36991-112694 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 15 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=108795181&loc=d3e32400-112679 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=77904769&loc=SL2265659-115463 + Details
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